2001403502381 has 2 divisors, whose sum is σ = 2001403502382. Its totient is φ = 2001403502380.

The previous prime is 2001403502257. The next prime is 2001403502401. The reversal of 2001403502381 is 1832053041002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1242536025481 + 758867476900 = 1114691^2 + 871130^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001403502381 - 2³⁸ = 1726525595437 is a prime.

It is a super-2 number, since 2×2001403502381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001403502881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000701751190 + 1000701751191.

It is an arithmetic number, because the mean of its divisors is an integer number (1000701751191).

Almost surely, 2^{2001403502381} is an apocalyptic number.

It is an amenable number.

2001403502381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001403502381 is an equidigital number, since it uses as much as digits as its factorization.

2001403502381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 2001403502381 its reverse (1832053041002), we get a palindrome (3833456543383).

The spelling of 2001403502381 in words is "two trillion, one billion, four hundred three million, five hundred two thousand, three hundred eighty-one".